I have same problem you do, size 15 and narrow. Originally had cwb hinge extra large and were too sloppy with no control(beginner didn't know any better), then tried the large alpha and they killed my feet also. The solution for me was the 11/12 Vantage was a little worried about velcro but has bee great for two seasons. The three adjustment poins make it to were it can be snug without cutting of circulation and my toes stick out a bit but better than no control with a larger boot.

Size 15 and narrow here as well, but the xxl zeus hinge open toe bindings were a miracle for me. Getting in and out is super easy and I haven't noticed any loss in support. I'm dieing to try the largest zeus closed toed bindings though.... the closed toe support sounds enticing.

I wear a size 13/14 and just got some new boots. I went to my local shop and tried on several different brands and styles, all closed toed. Hyperlite, Byerly and Ronix all make a 13/14 that fit me feet very well. LF in a closed toe comes in a 12/13 as there biggest, and they were to short and too narrow for me. I ended up getting the Ronix Reliks. They are very comfortable and not stiff. Easy to get in and out of as well.

I do have a pair of 08 CWB Zues close toed boots, that worked great for me. Only problem with them is that they are about an inch longer in length, so they had a problem with the toes of the boot over hanging the front edge of the board some. From what I have heard the new CWB boots are smaller then previous years. My buddy who has always worn a L is no wearing an XL.